School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning Province 110016, PR China.
School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning Province 110016, PR China.
Food Chem. 2023 Jan 1;398:133935. doi: 10.1016/j.foodchem.2022.133935. Epub 2022 Aug 12.
Nitrite is a widely used food additive that has been shown to be carcinogenic and can cause health damage when consumed in excess. Therefore, developing a detection method is in demand. Here, we prepared a novel Fe-doped carbon dots (Fe-CDs) using metallic deep eutectic solvent (MDES) which showed high sensitivity and selectivity. Besides, it also showed excellent pH-dependent luminescence characteristics, which proved the feasibility as a pH sensor. Under the optimal conditions, the detection linear of nitrite ranged from 0.2 to 80 µM, and the detection limit was 50 nM. The recovery rate was between 98.8 % and 104.1 % in food and water samples. For pH monitoring, its fluorescence intensity was linearly correlated in the pH range from 2 to 7, accompanying a unique differential solution color change of colorless-yellow-green. Therefore, it can be used as an excellent fluorescent probe for detection of nitrite and pH in food and water environment.
亚硝酸盐是一种广泛使用的食品添加剂，已被证明具有致癌性，过量摄入会对健康造成损害。因此，开发一种检测方法是有需求的。在这里，我们使用金属深共晶溶剂 (MDES) 制备了一种新型的 Fe 掺杂碳点 (Fe-CDs)，其具有高灵敏度和选择性。此外，它还表现出优异的 pH 依赖性发光特性，证明了作为 pH 传感器的可行性。在最佳条件下，亚硝酸盐的检测线性范围为 0.2 至 80 µM，检测限为 50 nM。在食品和水样中的回收率在 98.8%至 104.1%之间。用于 pH 监测时，其荧光强度在 pH 2 至 7 的范围内呈线性相关，同时伴随有无色-黄色-绿色的独特差分溶液颜色变化。因此，它可以用作食品和水环境中亚硝酸盐和 pH 值检测的优秀荧光探针。
